Babolat Synthetic Gut 17 660' String Reels An all around performance string, the Babolat Synthetic Gut 17 generates more spin and provides a more lively feel, but slightly lower durability compared to the 16 gauge version. The string is constructed by combining a large monofilament central core with a layer of smaller outerwraps... Size - (See Description) | Color - (Natural) Authorized Babolat Dealer. All racquets are strung and ready for the courts! SEE SELLER DETAILS FOR RETURN POLICY.